US6356041B1 - Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply - Google Patents
Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply Download PDFInfo
- Publication number
- US6356041B1 US6356041B1 US09/580,935 US58093500A US6356041B1 US 6356041 B1 US6356041 B1 US 6356041B1 US 58093500 A US58093500 A US 58093500A US 6356041 B1 US6356041 B1 US 6356041B1
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- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/265—Means for starting or running a triphase motor on a single phase supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
Definitions
- the present invention is directed to a master three-phase induction motor with satellite three-phase motors driven by a single-phase supply and method.
- a three-phase induction motor can be efficiently driven by a single-phase power supply by splitting the three windings into six and connecting them into two symmetrical half motors.
- the symmetrical motor may be a dual or double DELTA as shown in FIG. 14B or a dual WYE or YY as shown in FIG. 14A.
- FIG. 15 of that patent for a dual WYE connection type motor.
- a motor system having a master three-phase induction motor with three winding pairs for driving one or more of smaller horsepower satellite three-phase induction motors, the master motor being driven by a single-phase power supply having a pair of supply lines, the three winding pairs being connected into two symmetrical double DELTA or double WYE half motors each having three terminals with one terminal being common and having voltage potentials, in response to the application of said single-phase power supply, with phases substantially at 120° from each other, the plurality of satellite motors being individually and, respectively, connected to one of the sets of three terminals.
- FIG. 1 is a block diagram of a motor system embodying the present invention
- FIG. 2 is a circuit diagram of a double DELTA symmetrical motor
- FIG. 3 is a circuit diagram of a double WYE symmetrical motor
- FIGS. 4 and 5 are circuit schematics illustrating the connection of satellite motors to the master motor
- FIG. 6 is a perspective drawing of an implementation of the invention in an irrigation system.
- FIG. 7 is a block diagram of a modification of a portion of FIG. 6 .
- a three-phase induction motor 10 which has six-windings connected in a manner to be discussed below, has a predetermined rated horsepower and drives by shaft 11 a pump load 12 which has a lower rated horsepower.
- the three-phase master motor may be 75 horsepower with pump load of 56 horsepower leaving a difference of 19 horsepower. This will be sufficient to drive several three-phase satellite motors indicated as 13 and 14 , all of which are connected via parallel three-phase lines to a control unit 16 which contains inboard running capacitors, contactors and logic circuits and an outboard unit 17 of starting capacitors.
- the entire system is driven from a single-phase supply voltage designated by lines L 1 and L 2 which is nominally 460 volts.
- the single-phase voltage is converted to a three-phase voltage on the output lines shown at 18 to drive the motor 10 and its pump load 12 .
- voltages are tapped off of the symmetrical half motor windings via the wire connection 18 of the master motor 10 to provide two three-phase sources 21 and 22 going to satellite motors 13 and 14 .
- the three-phase lines are in parallel to the satellite motors so that each satellite motor may be controlled individually.
- the representative satellite motor 13 is illustrated by the transmission and switching system shown in 21 being driven in the forward direction by closure of the switch set SW 1 or reversed by reversal of any two of the three-phase wires as indicated by the reverse switches in a manner well known in the art.
- FIG. 2 illustrates two half motor windings in a dual DELTA or double DELTA connections for the motor 10 which are designated variously W 1 through W 12 , and the single-phase supply lines L 1 and L 2 .
- the center tap of the dual DELTA is terminal T 27 which is connected to winding terminals W 2 , W 4 , W 7 and W 11 . This terminal may also be called a central terminal because it is the series connection between the two DELTA half motor winding portions.
- External terminal T 1 is connected to winding terminals W 1 and W 6 , and T 3 to W 3 and W 5 .
- the various run capacitors as shown by the run capacitor bank 31 include run capacitors C 1 , C 2 and C 3 . It has been observed when the motor 10 is running that the voltages between these three terminals is an almost or substantially balanced three-phase voltage; i.e., the voltage potentials are substantially 120 degrees from each other. And this is also true of the other symmetrical half motor which includes the terminals T 8 , T 10 and the common terminal 27 .
- a start capacitor bank 32 is also illustrated, which includes the start contactors SC 1 through SC 4 which are temporarily actuated as described in the above Smith patent along with the start capacitors CS 3 , CS 8 , CS 9 and CS 7 . All of these run and start capacitors are described in the above Smith patents and especially the '188 patent.
- FIG. 3 is almost identical to FIG. 2, but the motor 10 ′ is now connected in a double WYE configuration.
- the same winding terminal notation W 1 , etc., is utilized.
- the first half motor includes the common terminal T 58 along with T 4 and T 6 and the other half motor terminals T 7 , T 9 and T 58 .
- run capacitor bank 31 and start capacitor bank 32 are identical to FIG. 2 and operate in the same manner. Specifically, the start capacitors and the run capacitors provide balanced currents and appropriate phase voltages in combination with the motor connection as described in the above Smith patents. This provides at the three output terminals of each half motor, a balanced three-phase voltage.
- the motor terminals may also be designated, besides T 27 and T 58 being the central terminal, with T 1 and T 4 can be regarded as second terminals, T 10 and T 7 also as second terminals, T 3 and T 6 as first extra terminals, and T 8 and T 9 as second extra terminals.
- the start capacitor bank 31 operates as follows. First, referring to FIG. 2, capacitor CS 3 injects a starting-current component into T 8 through contacts SC 3 of the start contactor. This current component lags the apparent line-to-pseudo-neutral voltage by 60° and is the 50% power-factor current component. Capacitor CS 9 injects a starting-current component into T 8 which lags the apparent line-to-pseudo-neutral voltage by 120°. The sum of these two current components is selected to equal a pre-selected locked-rotor line current, which is usually the master motor locked-rotor current. Capacitor CS 8 is equal in microfarads to capacitor CS 9 . It injects a starting current component into T 3 so that the winding currents on starting are symmetrical and balanced. Capacitor CS 7 is chosen to adjust the single-phase line power-factor to unity.
- capacitor CS 3 injects a starting-current component into T 9 through contacts SC 3 of the start contactor. This current component lags the line-to-neutral voltage of W9-W12 by 60°, and can be called the 50% power-factor current.
- Capacitor CS 9 injects a starting-current component into T 9 which lags the line-to-neutral voltage of W9-W12 by 120°. The sum of these two current components into T 9 is selected to equal a pre-selected locked-rotor line current, which is usually the locked-rotor current of the master motor.
- Capacitor CS 8 is equal in microfarads to capacitor CS 9 .
- Capacitor CS 7 is chosen to adjust the single-phase line power-factor to unity at locked rotor.
- the values of the run capacitors can be understood by an example.
- the master motor is rated 75 horsepower, with a full-load-3-phase line current of 85.6 amperes at 86.5% power factor.
- the shaft of this motor is connected to a pump which requires 56.25 horsepower on the shaft. With this shaft load, the motor efficiency is 95.3% and the three-phase line current is 66.6 amperes at 83% power-factor, which is a current lag angle of 33.9°. In rectangular coordinates, this load current is 55.3-j 37.15 amperes, at 460 volts. This component will be injected into T 9 or T 8 .
- Eight small drive motors of 2 horsepower each add to a total load of 16 horsepower. Four of these will be on one 230-volt supply, and the other four will be on the other half motor 230-volt supply, to balance the currents and loads. Each of these small motors has an efficiency of 86.5% and power factor of 83%, and the three-phase line current is 5 amperes at 230 volts, or 2.5 amperes at 460 volts. With all eight motors connected, the equivalent 460-volt load is 20 amperes at 83% power factor, a phase lag angle of 33.9°. To supply these eight motors, a rectangular coordinate current component must be injected of 16.6-j 11.16 amperes.
- the master motor has an injected locked-rotor current of 677 amperes at 35.1% power-factor.
- FIGS. 4 and 5 show in detail the connections as already illustrated by circuit connection 21 in FIG. 1 .
- FIG. 4 illustrates the terminal connections which are in parallel through a switch SWI supplying one or more satellite motors from the first symmetrical half motors for both the double DELTA, that is T 1 , T 3 , T 27 and the double WYE, T 4 , T 6 , T 58 .
- FIG. 5 with reference to switch SW 2 shows the connections from the second symmetrical half motors.
- the switches SW 1 and SW 2 would have a reverse capability as illustrated in FIG. 1 .
- the switches would also have a timing capability for irrigation purposes as illustrated in FIG. 6 .
- the master motor 10 with a pump load 12 is illustrated along with the control unit 16 receiving single-phase power and power lines L 1 and L 2 .
- Pump 12 via the hydraulic pipe 31 is connected at a pivot point 32 so that the arm 33 containing sprinkler nozzles 34 a, 34 b and 34 c may be rotated in an agricultural field.
- the electrical cables designated 36 there are separate three-phase cables for each motor as has been previously indicated. Satellite motors 38 and 39 are indicated on the drive wheels of the sprinkler arm 33 .
- electrical cabling 36 would have as many wires as three times the number of satellite motors.
- FIG. 7 illustrates a worm gear 41 arrangement being driven by a satellite motor 42 .
- the inner radius motors would be actuated for a lesser amount of time than the outer radius motors.
- the reversing switch as shown, at the axis of rotation 32 , either direction of rotation may be achieved which is a necessity in the irrigation devices otherwise the electrical cabling 36 would be twisted beyond its reasonable capability.
- the present invention has many other applications. For example, in a machine shop where the master motor drives a large air compressor and also feeds several smaller three-phase motors used on machine tools.
- the balanced three-phase voltages which are generated by that system may be utilized in a satellite motor system.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
Abstract
Description
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/580,935 US6356041B1 (en) | 2000-05-25 | 2000-05-25 | Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply |
Applications Claiming Priority (1)
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US09/580,935 US6356041B1 (en) | 2000-05-25 | 2000-05-25 | Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply |
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US6356041B1 true US6356041B1 (en) | 2002-03-12 |
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US09/580,935 Expired - Lifetime US6356041B1 (en) | 2000-05-25 | 2000-05-25 | Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002060034A2 (en) * | 2001-01-26 | 2002-08-01 | Larry Stuart Pendell | Induction generator system and method |
US6509703B1 (en) * | 2000-11-28 | 2003-01-21 | Husky Injection Molding Systems, Ltd. | Method and system for reduced voltage start-up of AC motors in multi-motor system |
US20030206804A1 (en) * | 2002-05-02 | 2003-11-06 | Smith Otto J.M. | Apparatus and method for driving a three-phase compressor from a single-phase electrical power supply |
US20040032127A1 (en) * | 2001-02-16 | 2004-02-19 | Masayoshi Tokiwa | Power system having generator driven by engine |
RU2537955C1 (en) * | 2013-07-09 | 2015-01-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Ульяновский государственный технический университет" | Device to start and compensate for reactive power of induction motor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3851232A (en) * | 1970-11-16 | 1974-11-26 | Garrett Corp | Electric vehicle propulsion system |
US4792740A (en) * | 1987-08-14 | 1988-12-20 | Smith Otto J M | Three-phase induction motor with single phase power supply |
US5300870A (en) * | 1990-10-05 | 1994-04-05 | Smith Otto J M | Three-phase motor control |
US5545965A (en) * | 1994-07-25 | 1996-08-13 | Smith; Otto J. M. | Three phase motor operated from a single phase power supply and phase converter |
US5760493A (en) * | 1995-11-21 | 1998-06-02 | Whirlpool Corporation | Dishwasher and control therefor |
-
2000
- 2000-05-25 US US09/580,935 patent/US6356041B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3851232A (en) * | 1970-11-16 | 1974-11-26 | Garrett Corp | Electric vehicle propulsion system |
US4792740A (en) * | 1987-08-14 | 1988-12-20 | Smith Otto J M | Three-phase induction motor with single phase power supply |
US5300870A (en) * | 1990-10-05 | 1994-04-05 | Smith Otto J M | Three-phase motor control |
US5545965A (en) * | 1994-07-25 | 1996-08-13 | Smith; Otto J. M. | Three phase motor operated from a single phase power supply and phase converter |
US5760493A (en) * | 1995-11-21 | 1998-06-02 | Whirlpool Corporation | Dishwasher and control therefor |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6509703B1 (en) * | 2000-11-28 | 2003-01-21 | Husky Injection Molding Systems, Ltd. | Method and system for reduced voltage start-up of AC motors in multi-motor system |
US6788031B2 (en) * | 2001-01-26 | 2004-09-07 | Larry Stuart Pendell | Induction generator system and method |
WO2002060034A3 (en) * | 2001-01-26 | 2003-05-01 | Larry Stuart Pendell | Induction generator system and method |
US20030094929A1 (en) * | 2001-01-26 | 2003-05-22 | Pendell Larry Stuart | Induction generator system and method |
WO2002060034A2 (en) * | 2001-01-26 | 2002-08-01 | Larry Stuart Pendell | Induction generator system and method |
US20040263110A1 (en) * | 2001-01-26 | 2004-12-30 | DG Power Systems, Inc. | Induction generator system and method |
US20040032127A1 (en) * | 2001-02-16 | 2004-02-19 | Masayoshi Tokiwa | Power system having generator driven by engine |
US7235891B2 (en) * | 2001-02-16 | 2007-06-26 | Masayoshi Tokiwa | Power system having generator driven by engine |
US20030206804A1 (en) * | 2002-05-02 | 2003-11-06 | Smith Otto J.M. | Apparatus and method for driving a three-phase compressor from a single-phase electrical power supply |
US7023167B2 (en) * | 2002-05-02 | 2006-04-04 | Smith Otto J M | Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit a starting capacitor and a resistive element |
US20060140789A1 (en) * | 2002-05-02 | 2006-06-29 | Smith Otto J | Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit, a starting capacitor and a resistive element |
US7408321B2 (en) * | 2002-05-02 | 2008-08-05 | Smith Otto J M | Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit, a starting capacitor and a resistive element |
US7612519B2 (en) | 2002-05-02 | 2009-11-03 | Smith Otto J M | Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit, a starting capacitor and a resistive element |
RU2537955C1 (en) * | 2013-07-09 | 2015-01-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Ульяновский государственный технический университет" | Device to start and compensate for reactive power of induction motor |
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Owner name: 123PHASE INC., WASHINGTON Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTION DATE OF THE ASSIGNMENT FROM OTTO J.A. SMITH TO 123PHASE INC. FROM APRIL 29, 2011 TO AUGUST 25, 2011 PREVIOUSLY RECORDED ON REEL 026836 FRAME 0555. ASSIGNOR(S) HEREBY CONFIRMS THE EXECUTION DATE OF THE ASSIGNMENT FROM OTTO J.A. SMITH TO 123PHASE INC. TO BE AUGUST 25, 2011;ASSIGNOR:SMITH, OTTO J.A.;REEL/FRAME:026844/0732 Effective date: 20110825 |
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